Latvia makes a huge difference. I'm assuming you need to find something local? Look into Nitro, they make good boards accross the price spectrum and their manufacturing is based in Europe. Nidecker also makes some good boards, I'd avoid anything that comes out of their Tunsina (sp?) factory. I have one of their Megalights and really enjoy it, high quality build and construction.

You can use anything you want for park. Doesn't mean it'll perform well. A stiff, heavy all mountain board makes for a clunky and clumsy ride in the park. But you can still use it yeah. It'll be harder to press, though it may give you some great pop. Maybe harder to air out of things, and to spin. Less forgiving on the sketchy landings. But yeah you could use it.

look more for a freestyle all mountain as opposed to freeride, and you'll be more pleased with the performance

no means to be offensive, but after four seasons id expect anyone to be well into airs and rails

anyways, if you want to be a park rat, i recommend forums park boards.. they're not too expensive and have pretty good tech
look at the scallywag or even research the honeypot..
they have some others too, or capita, i've heard a lot about them recently